In cross builds of chrome/win, the host and target toolchains currently
have the same name. To fix this, rename clang_x64 to win_clang_x64.
Because the toolchain name is also referenced in libyuv, this requires
a five-sided change:
1. Introduce variable containing the toolchain name in src.git
2. Change libyuv to refer to the variable
3* Rename toolchain in src.git (including in the newly introduced var)
4. Let libyuv refer to the new name directly
5. Remove variable again
(See also https://codereview.chromium.org/2463143002)
TBR=pastarmovj,wfh,dschuff
Bug: 748501
Change-Id: Ifad35c6d2d0c29404637421a36a2a6bfeaa113c5
Reviewed-on: https://chromium-review.googlesource.com/585151
Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489403}